To cite package ‘primes’ in publications use:

  Keyes O, Egeler P (2023). _primes: Fast Functions for Prime Numbers_.
  R package version 1.6.0, <https://github.com/ironholds/primes>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {primes: Fast Functions for Prime Numbers},
    author = {Os Keyes and Paul Egeler},
    year = {2023},
    note = {R package version 1.6.0},
    url = {https://github.com/ironholds/primes},
  }